When it comes to diagnosing and repairing Chevrolet vehicles, the U2143 code is one of the most common codes that may appear. This code is associated with the “lost communications with steering angle sensor (SAS)” error, and is a clear indicator that something is wrong with the steering system. The system voltage for the vehicle must be between 9-16 volts in order for serial data communication to occur. If the code is detected, it is important to identify the cause and take the necessary steps to resolve the issue.
Causes and Solutions of Chevrolet U2143 Code
| Cause | Solution |
|---|---|
| Use the DTC Descriptor list to determine the module which is not communicating | Check the voltage at the powertrain control module (PCM) and inspect the wiring for damage |
| If there are multiple non-communicating modules, choose the one closest to the data link connector (DLC) | Replace the module if necessary |
| Some modules may not have internal protection for spec | Use a scan tool to clear the DTC codes |
| The power mode master requires serial data communication to occur | Check the wiring harness for damaged, shorted, disconnected, or corroded pins |
Check the Voltage at the Powertrain Control Module
The powertrain control module (PCM) must have the right voltage in order for the system to work properly. A scan tool is required to check the voltage, and if the voltage is not between 9-16 volts, the wiring must be inspected for any damage. If any damage is found, the wiring must be replaced.
Use the DTC Descriptor List
If there are multiple non-communicating modules, the DTC Descriptor list can be used to determine which one is not communicating. The list should be consulted to find the module closest to the data link connector (DLC). After this, the wiring must be inspected for any damage.
Check the Wiring Harness for Damaged Pins
The power mode master requires serial data communication to occur, and if there is a lack of communication, the wiring harness must be checked for any damaged, shorted, disconnected, or corroded pins. If any of these are found, the wiring must be replaced.
Use a Scan Tool to Clear the DTC Codes
Some modules may not have internal protection for certain voltage specs, and this can cause the system to not function as it should. In this case, a scan tool can be used to clear the DTC codes and reset the system.
Conclusion
The Chevrolet U2143 code is a common issue that can indicate something is wrong with the steering system. It is important to identify the cause and take the necessary steps to resolve the issue. Solutions include checking the voltage at the powertrain control module, using the DTC Descriptor list to determine the module which is not communicating, checking the wiring harness for damaged pins, and using a scan tool to clear the DTC codes. It is essential to address the Chevrolet U2143 Code as soon as possible in order to avoid further damage to the vehicle.
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